<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>60秒只能发送一次短信</title>
</head>
<body>
<label><input type="text"></label><button id="btn">发送</button>
<script src="60秒只能发送一次短信.js"></script>
</body>
</html>